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笔者在教学中发现延边教育出版社出版的《新课标教案———物理必修2》第五章能力检测题第20题,对圆锥摆存在错误认识.原题一个质量为1kg的物体,用绳子a、b系图1在一根直杆上的A、B两点,如图1所示.AB=1.6m,a、b长均为1m.求直杆旋转的角速度ω=3rad/s时,a、b绳上的张力各是多大?
In the teaching, the author discovered that the 20th problem of the fifth chapter of the ability detection problem in the New Course Standard Teaching Plan—Physical Compulsory 2 published by Yanbian Education Press contained incorrect understanding of the conical pendulum. The original title was an object with a mass of 1 kg, The ropes a and b are two points A and B in Figure 1 on a straight rod, as shown in Fig. 1. AB=1.6m, a and b are 1m in length. Calculate the angular velocity of straight rod rotation ω=3rad/s What is the tension on the ropes a and b?